/*
 * Copyright 2013 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package io.netty.handler.codec.socksx.v5;

/**
 * The authentication method of SOCKS5.
 */
public class Socks5AuthMethod implements Comparable<Socks5AuthMethod>
{

    public static final Socks5AuthMethod NO_AUTH = new Socks5AuthMethod(0x00,
            "NO_AUTH");

    public static final Socks5AuthMethod GSSAPI = new Socks5AuthMethod(0x01,
            "GSSAPI");

    public static final Socks5AuthMethod PASSWORD = new Socks5AuthMethod(0x02,
            "PASSWORD");

    /**
     * Indicates that the server does not accept any authentication methods the
     * client proposed.
     */
    public static final Socks5AuthMethod UNACCEPTED = new Socks5AuthMethod(0xff,
            "UNACCEPTED");

    public static Socks5AuthMethod valueOf(byte b)
    {
        switch (b)
        {
            case 0x00:
                return NO_AUTH;
            case 0x01:
                return GSSAPI;
            case 0x02:
                return PASSWORD;
            case (byte) 0xFF:
                return UNACCEPTED;
        }

        return new Socks5AuthMethod(b);
    }

    private final byte byteValue;

    private final String name;

    private String text;

    public Socks5AuthMethod(int byteValue)
    {
        this(byteValue, "UNKNOWN");
    }

    public Socks5AuthMethod(int byteValue, String name)
    {
        if (name == null)
        {
            throw new NullPointerException("name");
        }

        this.byteValue = (byte) byteValue;
        this.name = name;
    }

    public byte byteValue()
    {
        return byteValue;
    }

    @Override
    public int hashCode()
    {
        return byteValue;
    }

    @Override
    public boolean equals(Object obj)
    {
        if (!(obj instanceof Socks5AuthMethod))
        {
            return false;
        }

        return byteValue == ((Socks5AuthMethod) obj).byteValue;
    }

    @Override
    public int compareTo(Socks5AuthMethod o)
    {
        return byteValue - o.byteValue;
    }

    @Override
    public String toString()
    {
        String text = this.text;
        if (text == null)
        {
            this.text = text = name + '(' + (byteValue & 0xFF) + ')';
        }
        return text;
    }
}
